1 /* Target-dependent code for Motorola 68000 BSD's.
2
3 Copyright (C) 2004-2024 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19
20 #include "arch-utils.h"
21 #include "frame.h"
22 #include "osabi.h"
23 #include "regcache.h"
24 #include "regset.h"
25 #include "trad-frame.h"
26 #include "tramp-frame.h"
27 #include "gdbtypes.h"
28
29 #include "m68k-tdep.h"
30 #include "netbsd-tdep.h"
31 #include "solib-svr4.h"
32
33 /* Core file support. */
34
35 /* Sizeof `struct reg' in <machine/reg.h>. */
36 #define M68KBSD_SIZEOF_GREGS (18 * 4)
37
38 /* Sizeof `struct fpreg' in <machine/reg.h. */
39 #define M68KBSD_SIZEOF_FPREGS (((8 * 3) + 3) * 4)
40
41 int
m68kbsd_fpreg_offset(struct gdbarch * gdbarch,int regnum)42 m68kbsd_fpreg_offset (struct gdbarch *gdbarch, int regnum)
43 {
44 int fp_len = gdbarch_register_type (gdbarch, regnum)->length ();
45
46 if (regnum >= M68K_FPC_REGNUM)
47 return 8 * fp_len + (regnum - M68K_FPC_REGNUM) * 4;
48
49 return (regnum - M68K_FP0_REGNUM) * fp_len;
50 }
51
52 /* Supply register REGNUM from the buffer specified by FPREGS and LEN
53 in the floating-point register set REGSET to register cache
54 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
55
56 static void
m68kbsd_supply_fpregset(const struct regset * regset,struct regcache * regcache,int regnum,const void * fpregs,size_t len)57 m68kbsd_supply_fpregset (const struct regset *regset,
58 struct regcache *regcache,
59 int regnum, const void *fpregs, size_t len)
60 {
61 struct gdbarch *gdbarch = regcache->arch ();
62 const gdb_byte *regs = (const gdb_byte *) fpregs;
63 int i;
64
65 gdb_assert (len >= M68KBSD_SIZEOF_FPREGS);
66
67 for (i = M68K_FP0_REGNUM; i <= M68K_PC_REGNUM; i++)
68 {
69 if (regnum == i || regnum == -1)
70 regcache->raw_supply (i, regs + m68kbsd_fpreg_offset (gdbarch, i));
71 }
72 }
73
74 /* Supply register REGNUM from the buffer specified by GREGS and LEN
75 in the general-purpose register set REGSET to register cache
76 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
77
78 static void
m68kbsd_supply_gregset(const struct regset * regset,struct regcache * regcache,int regnum,const void * gregs,size_t len)79 m68kbsd_supply_gregset (const struct regset *regset,
80 struct regcache *regcache,
81 int regnum, const void *gregs, size_t len)
82 {
83 const gdb_byte *regs = (const gdb_byte *) gregs;
84 int i;
85
86 gdb_assert (len >= M68KBSD_SIZEOF_GREGS);
87
88 for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++)
89 {
90 if (regnum == i || regnum == -1)
91 regcache->raw_supply (i, regs + i * 4);
92 }
93
94 if (len >= M68KBSD_SIZEOF_GREGS + M68KBSD_SIZEOF_FPREGS)
95 {
96 regs += M68KBSD_SIZEOF_GREGS;
97 len -= M68KBSD_SIZEOF_GREGS;
98 m68kbsd_supply_fpregset (regset, regcache, regnum, regs, len);
99 }
100 }
101
102 /* Motorola 68000 register sets. */
103
104 static const struct regset m68kbsd_gregset =
105 {
106 NULL,
107 m68kbsd_supply_gregset,
108 NULL,
109 REGSET_VARIABLE_SIZE
110 };
111
112 static const struct regset m68kbsd_fpregset =
113 {
114 NULL,
115 m68kbsd_supply_fpregset
116 };
117
118 /* Iterate over core file register note sections. */
119
120 static void
m68kbsd_iterate_over_regset_sections(struct gdbarch * gdbarch,iterate_over_regset_sections_cb * cb,void * cb_data,const struct regcache * regcache)121 m68kbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
122 iterate_over_regset_sections_cb *cb,
123 void *cb_data,
124 const struct regcache *regcache)
125 {
126 cb (".reg", M68KBSD_SIZEOF_GREGS, M68KBSD_SIZEOF_GREGS, &m68kbsd_gregset,
127 NULL, cb_data);
128 cb (".reg2", M68KBSD_SIZEOF_FPREGS, M68KBSD_SIZEOF_FPREGS, &m68kbsd_fpregset,
129 NULL, cb_data);
130 }
131
132
133 static void
m68kbsd_init_abi(struct gdbarch_info info,struct gdbarch * gdbarch)134 m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
135 {
136 m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch);
137
138 nbsd_init_abi (info, gdbarch);
139
140 tdep->jb_pc = 5;
141 tdep->jb_elt_size = 4;
142
143 set_gdbarch_decr_pc_after_break (gdbarch, 2);
144
145 set_gdbarch_iterate_over_regset_sections
146 (gdbarch, m68kbsd_iterate_over_regset_sections);
147
148 /* NetBSD ELF uses the SVR4 ABI. */
149 m68k_svr4_init_abi (info, gdbarch);
150 tdep->struct_return = pcc_struct_return;
151
152 /* NetBSD ELF uses SVR4-style shared libraries. */
153 set_solib_svr4_fetch_link_map_offsets
154 (gdbarch, svr4_ilp32_fetch_link_map_offsets);
155 }
156
157 void _initialize_m68kbsd_tdep ();
158 void
_initialize_m68kbsd_tdep()159 _initialize_m68kbsd_tdep ()
160 {
161 gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD,
162 m68kbsd_init_abi);
163 }
164